文章摘要
邱峰.木质素改性聚羧酸减水剂研究(1)——合成、表征与性能[J].精细化工,2019,36(11):
木质素改性聚羧酸减水剂研究(1)——合成、表征与性能
Lignin modified polycarboxylic superplasticizer (1) - Synthesis, Characterization and Properties
投稿时间:2018-12-15  修订日期:2019-07-30
DOI:
中文关键词: 聚羧酸减水剂  改性聚氧乙烯醚单体  木质素  表征  合成  分散性  流动度  流变模型
英文关键词: Polycarboxylate Superplasticizer, modified polyether monomer, lignin, characterization, synthesis,dispersion, fluidity, rheological model
基金项目:
作者单位E-mail
邱峰 辽宁石油化工大学 zhl6650370@163.com 
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中文摘要:
      以木质素和不饱和聚氧乙烯醚为原料,制得木质素改性聚氧乙烯醚单体(KL-TPEG),并采用KL-TPEG为原料制得了一系列木质素含量不同的木质素基聚羧酸减水剂PCE-Ls。对PCE-Ls进行了结构表征,并以分散性、流变性及对混凝土抗压强度测试了PCE-Ls与普通聚羧酸减水剂(PCE-B)的性能差异。结果表明,PCE-Ls具有较好的表面活性和引气性能,5min泡沫高度>50mm,远高于PCE-B的20mm。质量浓度50g/L时,表面张力仅为36.01mN/m。与传统聚羧酸减水剂PCE-B相比在分散性上差异不大,而PCE-Ls的初始流动度均高于300mm;PCE-Ls分散的混凝土坍落度均在110mm以上,具有较好的和易性。拟合模型表明,PCE-Ls分散的水泥浆体具有更低的屈服应力、更好的稳定性和更低的塑性黏度。
英文摘要:
      Lignin-modified polyoxyethylene ether monomer (KL-TPEG) was prepared from lignin and unsaturated polyoxyethylene ether. A series of lignin-based polycarboxylic acid water reducers PCE-Ls with different lignin content were prepared from KL-TPEG. The structure of PCE-Ls was characterized, and the properties of PCE-Ls and PCE-B were tested by dispersibility, rheology and compressive strength of concrete. The results showed that PCE-Ls had good surface activity and air entraining properties, and the 5min foam height was >50mm, much higher than that of PCE-B 20mm. The surface tension is only 36.01 mN/m when the mass concentration is 50 g/L. Compared with the traditional Polycarboxylic Water Reducer PCE-B, the dispersion of PCE-Ls is not much different, but the initial fluidity of PCE-Ls is higher than 300 mm; the slump of PCE-Ls dispersed concrete is more than 110 mm, which has better and easier performance. The fitting model shows that PCE-Ls dispersed cement paste has lower yield stress, better stability and lower plastic viscosity.
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